Enhanced performance of coal-based adsorbents in removing phenols from highly concentrated coking wastewater: Targeting large-scale applications

IF 3.2 4区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY Journal of the Indian Chemical Society Pub Date : 2024-09-14 DOI:10.1016/j.jics.2024.101376
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Abstract

Coking wastewater threatens the ecology and environment significantly, but it still has challenges in the efficient removal of organic contaminants due to its complex composition and inadequate biochemical properties. Low-cost coal-based material has potential in treating coking wastewater due to its special structure and surface oxygenic functional groups. In this work, gangue-based materials were modified in different ways and applied to coking wastewater treatment. Combined with the comprehensive analysis of the adsorbents' morphology, structure, and composition with SEM, XRD, FT-IR, XPS, etc., the adsorption behaviors and regeneration properties were extensively investigated. Notably the adsorption and regeneration capacity of the adsorbents are significantly enhanced after modification, BY-C2 exhibits a remarkable COD removal rate of 90.2 % from real coking wastewater, which remains stable at 72.0 % even after 10 cycles. The pseudo-second-order kinetic model and Freundlich isotherm model are found to fit well with the adsorption processes of phenolic compounds in coking wastewater. The adsorption mechanism involves hydrogen bonding, van der Waals' force, capillary forces and electrostatic attraction. This work paves the way for the large-scaled application of coal-based adsorbents in coking wastewater treatment and the subsequent recycling of high-valued organic pollutants.

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提高煤基吸附剂去除高浓度焦化废水中酚类物质的性能:以大规模应用为目标
焦化废水对生态和环境的威胁很大,但由于其成分复杂、可生化性不足,在有效去除有机污染物方面仍面临挑战。低成本煤基材料因其特殊的结构和表面含氧官能团,在处理焦化废水方面具有潜力。本研究对煤矸石基材料进行了不同的改性,并将其应用于焦化废水处理。结合 SEM、XRD、FT-IR、XPS 等对吸附剂形貌、结构和组成的综合分析,对其吸附行为和再生性能进行了广泛的研究。结果表明,改性后吸附剂的吸附能力和再生能力显著提高,BY-C2 对实际焦化废水中 COD 的去除率高达 90.2%,即使在 10 次循环后仍能稳定在 72.0%。假二阶动力学模型和 Freundlich 等温线模型与焦化废水中酚类化合物的吸附过程十分吻合。吸附机理涉及氢键、范德华力、毛细管力和静电吸引。这项工作为煤基吸附剂在焦化废水处理中的大规模应用以及后续高价值有机污染物的回收利用铺平了道路。
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来源期刊
CiteScore
3.50
自引率
7.70%
发文量
492
审稿时长
3-8 weeks
期刊介绍: The Journal of the Indian Chemical Society publishes original, fundamental, theorical, experimental research work of highest quality in all areas of chemistry, biochemistry, medicinal chemistry, electrochemistry, agrochemistry, chemical engineering and technology, food chemistry, environmental chemistry, etc.
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